Hi, Welcome to HCM, I am Dr. Das
Look, Carcinoma is a microscopic event. Even if surgery is succesful and negative lymphnode and no metastasis it cant be said you are cured. Because by doing surgery the mass is removed but not its previous effect.
That is when a cancer is detected it has completed it most of aggressiveness. So, there may be presence of micrometastasis
which can not be identified now but can show up later.
For this reason you have to take chemotherapy
which will nearly complete the eradication.
So just go for it.